Stewart said he and Lancaster are expecting the new addition “just before Mummy’s 40th birthday,” which is March 15 of next year; Stewart will turn 66 on January 10. When the child is old enough to drink in England, Stewart will be 84.The new baby’s half-siblings will include Kimberly Stewart, one of many rocker daughters who are models; Celebrity Rehab veteran Sean Stewart, who is 29; and 23-year-old Ruby, who is also a model—though, at Rod’s request, not for Ultimo, a Scottish lingerie brand for which his current wife and ex-wife have both worked. The current baby in the family is four-year-old Alastair, about whom Stewart shared an adorable soccer-related anecdote last year:

“I did take [Alastair] out on the football field the other day,” he told the British talk show GMTV in November. “I said, ‘Come on, let’s get running out there,’ and he went, ‘Oh, there’s some flowers for mummy—must collect them.’ He spent about two hours collecting flowers in a basket for his mum!”